begriffs open source - cmsis/blob - CMSIS/Documentation/Doxygen/Driver/src/I2C_SlaveDemo.c

   1 #include "Driver_I2C.h"
   2
   3 /* I2C driver instance */
   4 extern ARM_DRIVER_I2C            Driver_I2C0;
   5 static ARM_DRIVER_I2C *I2Cdrv = &Driver_I2C0;
   6
   7 static volatile uint32_t I2C_Event;
   8
   9 /* I2C Signal Event function callback */
  10 static void I2C_SignalEvent (uint32_t event) {
  11   I2C_Event |= event;
  12 }
  13
  14 int main (void) {
  15   uint8_t cnt = 0;
  16
  17   /* Initialize I2C peripheral */
  18   I2Cdrv->Initialize(I2C_SignalEvent);
  19
  20   /* Power-on I2C peripheral */
  21   I2Cdrv->PowerControl(ARM_POWER_FULL);
  22
  23   /* Configure I2C bus */
  24   I2Cdrv->Control(ARM_I2C_OWN_ADDRESS, 0x78);
  25
  26   I2C_Event = 0;
  27
  28   while (1) {
  29     /* Receive chunk */
  30     I2Cdrv->SlaveReceive(&cnt, 1);
  31     while ((I2C_Event & ARM_I2C_EVENT_TRANSFER_DONE) == 0);
  32     /* Clear transfer done flag */
  33     I2C_Event &= ~ARM_I2C_EVENT_TRANSFER_DONE;
  34
  35     /* Transmit chunk back */
  36     I2Cdrv->SlaveTransmit(&cnt, 1);
  37     while ((I2C_Event & ARM_I2C_EVENT_TRANSFER_DONE) == 0);
  38     /* Clear transfer done flag */
  39     I2C_Event &= ~ARM_I2C_EVENT_TRANSFER_DONE;
  40   }
  41 }